Grade sight



E. J. BENDIST. GRADE SIGHT. APPLICATION. rim) JAN-21 1920.

Patented Aug. 1, 1922.

m E N M U A ENRIQUE JUAN BENOIST, OF VIFTA DEL MAR, CHILE.

GRADE SIGHT.

ineaeis.

Specification of Letters Patent.

Patented Aug. 1, 1922.

Application filed January 21, 1920. Serial No. 353,015.

To all ii /tom it may concern.

Be it known that I, ENRI UE JUAN Bns'orsr, a citizen of the Republic of Chile, South America, have invented new and useful Improvements in Grade Sights, of which the following is a specification.

My invention relates to improvements in grade-sights, adapted for use in ascertaining the gradeor slope in underground work, while not necessarily restricted to this use.

An important object of the invention is to provide a device of the above mentioned character, which is simple in construction, convenient in use, and embodying elements which may be separated so that the device may be carried in the pocket or the like.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of a device embodying my invention,

Figure 2 is a plan view of the same,

Figure 3 is a transverse section taken on line 33 of Figure 1, looking in the direction of the arrows. Figure 4 is a longi tudinal section taken on line 4t 1- of Figure 2, and,

Figure 5 is a side elevation of a V-sight.

Figure 6 is a fragmentary View with parts broken away showing the manner of calibrating the instrument, and Figure 7 is a fragmentary perspective view. illustratingthe forward end of the device and showing the complete end sight.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 10 designates the body portion of the device, which is trough-shaped, or U-shaped in cross section. The top of the body portion 10 is open, and its sides 11 are provided at points equidistantly spaced with openings or notches 1.2. Arranged at these openings or notches, are plates 13, secured to the outer surfaces of the sides 11 by screws 14 or the like. The plates 13 are provided with openings 15, forming hooks 16, the notches 17 of which are equi-distantly spaced from the ends of the body portion 10. The hooks 16 are adapted to engage with a line or cord 18, which is preferably strong and fine.

- The numeral 18 designates a plate, se-

cured to the bottom of the body portion 10, at its center, by screws 19. This plate has an internally screwthreaded socket 20, depending therefrom for detachably receiving a screw-threaded stud 21, carried by a plumbbob 22, which is preferably formed of metal, to impart to the same a suitable weight. This plumb-bob, when the body portion 10 is suspended from the cord 18, will hold the same in a horizontal position. The plumbbob 22 may be separated from the body portion, when desired, for convenient handling of the device or placing the same in the pockets or the like.

Arranged within the forward end of the body portion 10 is a scale plate 23, held stationary by screws 24 or the like. This scale plate has an upstanding flange 25, provided with a sight-opening 26. The numeral 27 designates an end sight element, having its inner end attached to the body portion 10 by screws 28 or the like. The end sight 27 has an upstanding blade or knife edge 29, arranged inwardly of and contacting with the flange 25. The forward end of the end sight 27 may be raised and lowered with respect to the flange 25, by means of an adjusting screw 30, engaging within a sleeve or bushing 31 and passing through an opening 32 in the scale plate 23.

In the rear end of the body portion 10 is arranged a reflector 33, disposed at an angle of 45 to the horizontal, and fitting within slots 34. This reflector is held in place by a top plate 35, engaged by a screw 36. The reflector 33 is provided upon its upper surface with a horizontal line 37. This reflector may be formed of a looking-glass or any other suitable material.

The end of the body portion near the reflector is also provided with vertical grooves 38, which are adapted to receive the edges of a rear V-sight 39, when the reflector is not used.

The forward end of the body portion of the device 10, is provided with a scale plate 10, as shown by Figure 6, with a unit of measurement as shown. In use and for the purpose of calibration of the grade-sight, the member 23 may be removed, leaving the knife edge front sight in its same relative position. This knife edged sight has indicated upon its surface adjacent to the said unit of measurement on the scale plate, a fixed mark 41 normally coinciding with the zero mark of the plate. In computing the or declination thus 'tity, corresponding to held vvi degree of elevation or declination of an object, in the distance, the adjusting of the knife edged sight by means of the adjusting screw will show the degree of such elevation forming a basis for the calibration. r I

In the use of the device, a string is stretched more or less horizontally at a convenient height, and m ore or less perpendicular to the drift. This string is located near a point from which an elevation can be readily taken, thus for instance from a rail, which. has been set at a selected grade. The body portion 10 of the device will now assume a horizontal position, and the height of the line of sight of the device is taken from the known level, in this instance the rail. This height is then'marked upon a stick or the like previously employed to ascertain the above referred to height, and such stick is carried forwardly to the place wherethegrade is required, and placed vertically. The point upon the stick may be easily found by running up or down the stick with an acetylene light, and when this correct point of the light co'ncides with the lineof sight of the device, the point of light will be at the line 8]. Theoperator then marks on the stick, the point of the light, which may be above or below the previous 'markupon the stick, and the distance between these two points maybe considered as a plus or minus quanthe grade sought.

The reflector 3S'may be removed andthe \l-sight 39 employed, the operator then standing behind the instrument and looking through the V -sight, to ascertain a point upon the stick which is in the line of sight Q t ns umen It is tobe understood that the form of my invention herewith shown and described is betaken, as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts maybe resorted to without departing from the spirit of myinvention, or the scope of the subjoine d claims Having thus claim 1. A grade sight of the character described,

described my invention, I

comprising a trough-shaped body portion,

plates securedv to the sides of the troughshaped body portion and carrying hooks, a plumbbob detachably connected with thefbottornof thebody portion and depending therefrom, a scale held within the forwere en of e b dy p rt on, m d sight hin such forward end '11 proximity to vertically adjust the t9 the cale, me n angularly arranged re end sight with relation to the scale, and an flector held within the rear end of the body portion.

,2. A grade sight of the character described, comprising a trough-shaped body portion, plates secured to the sides of the body portion and carrying suspension elements, a plumb-bob detachably secured to the body portion between the ends thereof, a scale held within the forward end of the body portion, an end sight held within such forward end and engaging the scale, means to vertically adjust the end sight with relation to the scale, and a coacting sighting device secured within-the rear end of the body portion. a v 3. A grade sight of the character described comprising a trough shaped body portion, plates secured to the sides of the body portion and carrying suspension elements, a plumbsbob detachably secured to the body portion between the ends thereof, a scale placed within the forward end of the body ortion comprising a plate with a unit of measurement thereon, an end sight adj acent to said plate having a horizontal indicating mark normally registering zero with relation to the scale plate, means to vertically adjust the end sight'with relation to the plate, v

cured within the rear end of the bodyportion. f. A grade sight of the character described, comprising a body portion'provided between its ends with suspension means, a plumbbob secured to the body portion-between its ends, a sighting'device arranged upon the forward end of thebody portion and a reflector arranged upon the rear end of the body portion having a line thereon adapted to coact with the sighting device.

V 5, A grade sight of the character described, comprising a body portion provided between its ends with suspension means, a plumb-hob secured to the body portion between its ends, a sighting device arranged and a coaoting sight-device se upon the forward end of the body portion 1 n veioun JUAN BENOIST. 

